Latest

flake.nix

@@ -81,6 +81,8 @@
 
           go
           gofumpt
+
+          nodejs
         ]);
 
         shellHook = ''

src/projectEuler/question1.hs

@@ -10,6 +10,8 @@ Find the sum of all the multiples of 3 or 5 below 1000.
 
 module Main where
 
+import           Data.List (union)
+
 main :: IO ()
 main = print ans
 
@@ -32,3 +34,8 @@ allXsUnderN x n = filter (isMultipleOf x) [1..n-1]
 
 allNumbersUnder :: Integral a => a -> [a]
 allNumbersUnder l = allXsUnderN 3 l <> allXsUnderN 5 l
+
+
+_3s = [3,6..999]
+_5s = [5,10..999]
+solution = sum $ union _3s _5s

src/projectEuler/question1.js

@@ -0,0 +1,23 @@
+/*
+https://projecteuler.net/problem=1
+If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9.
+The sum of these multiples is 23.
+
+Find the sum of all the multiples of 3 or 5 below 1000.
+*/
+const is3 = (n) => n % 3 === 0;
+const is5 = (n) => n % 5 === 0;
+
+const isMultipleOf = (m) => (n) => n % m === 0;
+const is3_ = isMultipleOf(3);
+const is5_ = isMultipleOf(5);
+
+const limit = 1000;
+let result = 0;
+for (let i = 0; i < limit; i++) {
+  if (is3(i) || is5(i)) {
+    result += i;
+  }
+}
+
+console.log(`Answer is ${result}`);